1999 Winnie 31C w/Ford chassis. Our AC basically iced up to the point of not kicking out cold air last time we used it. I'm pretty sure it's the Coleman 6799-806. Does this mean it needs the refrigerant re-charged? Or what?
I don’t know why the unit is freezing up on your RV. But, generally there is no option to add refrigerant to rooftop A/C units. They do not come with fill valves. Rarely you’ll find one that someone has had such a valve braised in.
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2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad
Not so fast, there are other reasons A/C units can ice up. One of the main ones is when the return air mixes too much with the new cold air. This happens in the ceiling portion of the A/C.
Sometimes running the fan on anything but high will cause icing. It should have a freeze sensor on the evaporator coil that shuts the unit off when icing occurs.
As creativepart said, make sure the plenum is sealed so chilled and return air cannot mix. I used aluminum duct tape.
__________________ 2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member,FMCA. "We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution." Abraham Lincoln
most of the time an evaporator coils freezes up do to low airflow, which gets lower and lower as the ice accumulates. Sometime a low refrigerant charge can do it but is is usually airflow.
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2007 Winnebago Journey 36SG and 2013 Honda CRV Toad
e-Trailer XHD Towbar (Demco) Blue Ox baseplate, SMI Stay N Play brakes
most of the time an evaporator coils freezes up do to low airflow, which gets lower and lower as the ice accumulates. Sometime a low refrigerant charge can do it but is is usually airflow.
. Yep. Clogged intake air filter will cause freeze up ...